A massive four-alarm fire that raged overnight for more than seven hours in a Bronx warehouse was under control early this morning, a fire department spokesman said. The blaze broke out last night just past 9:30 p.m. at 495 Walton Avenue near East 146th Street in the South Bronx. About 170 firefighters responded to the fire and brought the flames under control at 5 a.m. Tuesday morning. Five firefighters were taken to Jacobi Medical Center with minor injuries, the fire department said. According to reports, two employees inside the building when the blaze broke out escaped safely. The two-story brick warehouse was used as a temporary storage facility for the personal belongings of individuals or families in the midst of moving. Much, and possibly all, of that property inside was destroyed in the blaze. “Everything is gone,” said building owner Reni Ismirly. He said the company has about 400 clients. A cause for the fire has not yet been identified.